<template>
	<view
		class="u-keyboard"
		@touchmove.stop.prevent="() => {}"
	>
		<view class="u-keyboard-grids">
			<view
				class="u-keyboard-grids-item"
				:class="[btnBgGray(index) ? 'u-bg-gray' : '', index <= 2 ? 'u-border-top' : '', index < 9 ? 'u-border-bottom' : '', (index + 1) % 3 != 0 ? 'u-border-right' : '']"
				:style="[itemStyle(index)]"
				v-for="(item, index) in numList"
				:key="index"
				:hover-class="hoverClass(index)"
				:hover-stay-time="100"
				@tap="keyboardClick(item)"
			>
				<view class="u-keyboard-grids-btn">{{ item }}</view>
			</view>
			<view
				class="u-keyboard-grids-item u-bg-gray"
				hover-class="u-hover-class"
				:hover-stay-time="100"
				@touchstart.stop="backspaceClick"
				@touchend="clearTimer"
			>
				<view class="u-keyboard-back u-keyboard-grids-btn">
					<u-icon
						name="backspace"
						:size="38"
						:bold="true"
					/>
				</view>
			</view>
		</view>
	</view>
</template>

<script>
export default {
  props: {
    // 键盘的类型，number-数字键盘，card-身份证键盘
    mode: {
      type: String,
      default: 'number'
    },
    // 是否显示键盘的"."符号
    dotEnabled: {
      type: Boolean,
      default: true
    },
    // 是否打乱键盘按键的顺序
    random: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      backspace: 'backspace', // 退格键内容
      dot: '.', // 点
      timer: null, // 长按多次删除的事件监听
      cardX: 'X' // 身份证的X符号
    }
  },
  computed: {
    // 键盘需要显示的内容
    numList() {
      const tmp = []

      if (!this.dotEnabled && this.mode == 'number') {
        if (!this.random) {
          return [1, 2, 3, 4, 5, 6, 7, 8, 9, 0]
        } else {
          return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, 0])
        }
      } else if (this.dotEnabled && this.mode == 'number') {
        if (!this.random) {
          return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0]
        } else {
          return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.dot, 0])
        }
      } else if (this.mode == 'card') {
        if (!this.random) {
          return [1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0]
        } else {
          return this.$u.randomArray([1, 2, 3, 4, 5, 6, 7, 8, 9, this.cardX, 0])
        }
      }
    },
    // 按键的样式，在非乱序&&数字键盘&&不显示点按钮时，index为9时，按键占位两个空间
    itemStyle() {
      return index => {
        const style = {}

        if (this.mode == 'number' && !this.dotEnabled && index == 9) style.flex = '0 0 66.6666666666%'
        return style
      }
    },
    // 是否让按键显示灰色，只在非乱序&&数字键盘&&且允许点按键的时候
    btnBgGray() {
      return index => {
        if (!this.random && index == 9 && (this.mode != 'number' || (this.mode == 'number' && this.dotEnabled))) return true
        else return false
      }
    },
    hoverClass() {
      return index => {
        if (!this.random && index == 9 && (this.mode == 'number' && this.dotEnabled || this.mode == 'card')) return 'u-hover-class'
        else return 'u-keyboard-hover'
      }
    }
  },
  methods: {
    // 点击退格键
    backspaceClick() {
      this.$emit('backspace')
      clearInterval(this.timer) // 再次清空定时器，防止重复注册定时器
      this.timer = null
      this.timer = setInterval(() => {
        this.$emit('backspace')
      }, 250)
    },
    clearTimer() {
      clearInterval(this.timer)
      this.timer = null
    },
    // 获取键盘显示的内容
    keyboardClick(val) {
      // 允许键盘显示点模式和触发非点按键时，将内容转为数字类型
      if (this.dotEnabled && val != this.dot && val != this.cardX) val = Number(val)
      this.$emit('change', val)
    }
  }
}
</script>

<style lang="scss" scoped>
	@import "../../libs/css/style.components.scss";

	.u-keyboard {
		position: relative;
		z-index: 1003;
	}

	.u-keyboard-grids {
		@include vue-flex;
		flex-wrap: wrap;
	}

	.u-keyboard-grids-item {
		flex: 0 0 33.3333333333%;
		text-align: center;
		font-size: 50rpx;
		color: #333;
		@include vue-flex;
		align-items: center;
		justify-content: center;
		height: 110rpx;
		font-weight: 500;
	}

	.u-bg-gray {
		background-color: $u-border-color;
	}

	.u-keyboard-back {
		font-size: 36rpx;
	}

	.u-keyboard-hover {
		background-color: #e7e6eb;
	}
</style>
